Vicon IX 2000 L Technical Information PDF herunterladen (Seite 241)

Spike

Vicon MX Hardware System Reference Glossary-25

Spike A point that lies to one side of an

otherwise smooth trajectory. A spike

appears as a sudden, dramatic rise or fall

in graph data. Spikes often occur as a

result of a poor reconstruction in a

particular frame and can be eliminated

using editing tools in Vicon application

software. Also see Frame, Point,

Reconstruction, and Trajectory.

Static calibration object A calibration

object used for setting the global

coordinate system in the capture volume.

An ergo calibration frame is one type of

static calibration object. Also see

Calibration kit, Calibration object,

Calibration volume, Ergo calibration

frame, and Global coordinate system.

Static trial A short data capture

(typically 3-5 seconds) during which the

subject stands in a stationary, neutral

pose to enable the Vicon system to

determine the location of key markers on

the subject. This type of trial is required

to optimize an autolabel process in Vicon

application software. Also see Neutral

pose, Motorcycle pose, T-pose and

Dynamic trial.

Step length A temporal parameter

used in gait analysis for the distance

along the line of progression from foot

contact by one foot to foot contact by the

other foot. Also see Foot contact and Gait

analysis.

Step time A temporal parameter used

in gait analysis for the period of time, or

the percentage of the gait cycle, from

foot off to foot contact by the same foot.

Also see Foot contact, Foot off, and Gait

analysis.

Step width A temporal parameter used

in gait analysis for the distance between

the specified foot marker and the

corresponding marker on the opposite

foot when a foot contact event occurs

along the line of progression. Also see

Foot contact and Gait analysis.

Stick A visual aid to illustrate the

connection between reconstructed

marker positions or between virtual

points in a kinematic model for a subject

whose motion is being captured or

analyzed in a Vicon system. This can be

visualized as an element of the 3D

representation of the subject. Also see

Kinematic model, Marker, and Subject.

Stride length A temporal parameter

used in gait analysis for the distance

along the line of progression from one

foot contact to the next foot contact by

the same foot. Also see Foot contact, Gait

analysis, and Stride time.

Stride time A temporal parameter used

in gait analysis for the period of time, or

the percentage of the gait cycle, from

foot off to foot contact by the same foot,

that is, the time taken for the foot to do a

full gait cycle. Also see Foot contact, Foot

off, and Gait analysis.

Strobe unit A specialized piece of

illumination equipment attached to the

front of a Vicon camera. The strobe unit

generates a bright flash of light, which

illuminates the retroreflective markers

attached to the subject or object whose

motion is being captured or analyzed in a

Vicon system. The strobe unit’s flash

coincides with the time the camera’s

shutter (if present) is open. Strobe units

can be fitted with Visible Red (VR), Near

Infrared (NIR), or Infrared (IR) Light

Emitting Diodes (LEDs).

Subject 1) The target of a trial, usually

a multi-segment being such as a person

or an animal wearing Vicon markers,

whose motion is being captured or

analyzed by a Vicon system. Also see

Trial, Capture volume, and Object.

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